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Re: ext2fs kernel profiling: most of the time in thread management
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From: |
Samuel Thibault |
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Subject: |
Re: ext2fs kernel profiling: most of the time in thread management |
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Date: |
Thu, 29 Dec 2011 17:41:24 +0100 |
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User-agent: |
Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30) |
Samuel Thibault, le Thu 29 Dec 2011 01:25:36 +0100, a écrit :
> It might be biaised by the clock not being able to tick everywhere in
> the kernel (though I guess e.g. most of the IPC machinery is running at
> ipl0?),
But the linux drivers do get an opportunity to run their bottom halves
etc. when spl goes back to 0. I've also tried under Xen:
pmap_page_protect: 16.600000%
ldt_init: 11.250000% ??? This is only called at boot...
vm_map_lookup_entry: 8.250000%
vm_object_deactivate_pages: 5.150000%
vm_object_copy_delayed: 4.150000%
vm_page_deactivate: 2.500000%
pmap_valid_page: 2.100000%
pmap_copy_page: 1.750000%
ipc_kmsg_copyin_body: 1.300000%
hurd_ihash_find: 1.000000%
disk_cache_block_ref: 0.900000%
zalloc: 0.900000%
mach_msg_trap: 0.900000%
pmap_protect: 0.750000%
__mach_msg: 0.700000%
zfree: 0.650000%
hurd_thread_self: 0.650000%
memset: 0.650000%
vm_map_entry_delete: 0.600000%
vm_page_lookup: 0.600000%
ipc_mqueue_receive: 0.550000%
ports_port_deref: 0.550000%
vm_fault_page: 0.550000%
pmap_remove: 0.550000%
vm_map_copyin: 0.500000%
ipc_mqueue_send: 0.500000%
vm_map_copyout: 0.500000%
...
Samuel